The convictions stem from more than 80 incidents of mail theft in Medford during January 2013. Police said Davis went to a Wells Fargo Bank and tried to cash checks he stole out of a mailbox on Ramada Drive. The transaction didn't go through, and police arrested Davis. Police went to his Brookhurst Street home and recovered mail stolen from about 30 addresses.

Two other members of the group have already been sentenced. Jesse Garrett Edwards, 31, pleaded guilty to three counts of aggravated identity theft in June. He was sentenced to 60 days in jail and two years of supervised probation, prosecutors said.

"We believed him at the time to be the main player-organizer in this group," Markiewicz said.

Ricky Edward Singley, 21, was sentenced in August to two years of supervised probation for identity theft and possession of marijuana. A methamphetamine possession charge was dismissed.

The year saw a significant leap in the number of mail thefts, typically from mailboxes that did not have locks. One case from July netted 23 arrests and more than 1,000 victims throughout Jackson County. It was the biggest mail theft case in Southern Oregon history, police said. The case is being handled federally.

"Honestly, it was a huge leap," said Medford Detective Sgt. Brent Mak. "I've been (with financial crimes) for a couple years as a sergeant, and I have never seen the amount of mail theft that we had this past year."